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Selecting the best:Interspecific and age-related diet differences among sympatric steppe passerines

Avian Research 2023年第4期14卷 611-622页

作者： Julia Zurdo Paula Gomez-Lopez Adrian Barrero Daniel Bustillo-de la Rosa Julia Gomez-Catasús Margarita Reverter Cristian Perez-Granados Manuel B.Morales Juan Traba Terrestrial Ecology Group Department of EcologyUniversidad Autonoma de Madrid(TEG-UAM)MadridSpain Centro de Investigacion en Biodiversidady Cambio Global Universidad Autonoma de Madrid(CIBC-UAM)MadridSpain Ecology Department/IMEM“Ramon Margalef” Universidad de AlicanteAlicanteSpain

Parental food provisioning is crucial for the growth and survival of *** rate depends on food quality and food supplied to offspring may differ from what adults use for their *** the case of steppe passerine birds,detailed characterization on nestling dietary composition,as well as prey choice and resource partitioning among species,is a pending *** differences between nestlings and adults remain also largely *** using faecal DNA metabarcoding,we described the diet of nestlings and adults of five shrub-steppe passerine species over the 2017–2019 breeding seasons in central *** also monitored arthropod availability in the field to assess dietary *** expected interspecific dietary differences to limit competition for food resources among sympatric species,as well as parental selection of high quality prey for *** also predicted age-related differences,with nestlings being fed nutrient-rich prey more frequently than *** main arthropod orders provisioned to nestlings were Orthoptera,Julida,Araneae and *** of the different species showed high interspecific diet overlap,indicating both a coincidence in growth needs among bird species and no or little limitation of the most profitable resources during the breeding *** of all species showed higher diet richness than nestlings,and age-related differences in prey composition were mainly driven by the selection of the most easily digestible,larger protein-and calcium-rich prey for nestlings,which may favour their rapid growth,and avoiding highly sclerotized and less nutritional prey such as *** study sheds light on the basic ecology and conservation of these declining steppe birds,indicating that interspecific competition may not be a major factor during the breeding *** the current global decline of arthropods,further long-term research would be necessary,along with the implementation of effective conservation measure

关键词： 18S Faecal material nestling diet Prey choice Resource partitioning

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Habitat preferences, flight cost and foraging strategies in the European Starling breeding in a heterogeneous agricultural landscape

Habitat preferences, flight cost and foraging strategies in ...

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23rd International Ornithological Congress

作者： Mns Bruun Henrik G.Smith Dennis Hassequist Lund University Ecological inst. Dept. of animal ecology Ecology building S-223 62 Lund Sweden Lund University Ecological inst. Dept. of animal ecology. Ecology building S-223 62 Lund Sweden henrik Lund University Ecological inst. Dept. of animal ecology Ecology building S-223 62 Lund Sweden

＜正＞ The European Starling has, like many other bird species associated with the agricultural landscape in Western Europe, declined in numbers during the last decades. This decline might be explained by changes in agricultural practices affecting the abundance and availability of food for breeding birds. Using radio-tracking, we evaluate the consequences of land-use on both food delivery rate to nestlings and foraging costs to parents. Starlings

关键词： Habitat preference foraging strategy agricultural intensification nestling diet

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